Are infrared dark clouds really quiescent? | Astronomy & Astrophysics (A&A)

Free Access

Table 3

IRAM 30 m observations on the four IRDCs.

Source	RA	Dec	Abbrev.	Source	RA	Dec.	abbrev.
	[J2000]	[J2000]			[J2000]	[J2000]

G28.34 S			G28.34 S	IRDC 18530			18530
IRDC 18306			18306	IRDC 18308			18308

Date^a	Source	Pointing	Focus	T_sys ^b		τ_{225 GHz} ^b
(yyyymmdd)				1 mm (K)	3 mm (K)

20140528	G28.34 S, 18530	Saturn, K3-50A, Venus, 1749+096	Saturn, Venus	450–550	115–130	0.5–0.6
20140529	18306, 18530	Saturn, K3-50A, 1749+096	Saturn	270–310	90–110	0.2–0.4
20140530	18306, 18308	Saturn, 1749+096	Saturn	275–285	90–100	0.2–0.4
20140531^∗	G28.34 S, 18306, 18308	W3OH, 1749+096	W3OH	210–280	90–110	0.1–0.3

Notes.

^(a)

“*” denotes the date when observational bands were tuned from 85.8–93.6 GHz to 85.2–92.9 GHz, and from 215.1–222.8 GHz to 217.0–224.8 GHz.

^(b)

T_sys and τ are averaged system temperature and precipitable water vapor in each observation.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.